1	Petals persistent, the claws of wing and keel ± adnate to the staminal tube; base of the stipules encircling the stem; (leaf mostly digitately trifoliolate, fruit straight)		Trifolium
+	Petals caducous, not attached to the staminal tube; base of stipules usually not encircling the stem		(2)
2 (1)	Fruit more than 3 times as long as calyx, almost straight, beaked		Trigonella
+	Fruit less than 3 times as long as calyx or spirally coiled		(3)
3 (2)	Fruit spirally coiled, inflorescence-rachis short, the flowers few or crowded		Medicago
+	Fruit straight, inflorescence-rachis elongated, many flowered		Melilotus